Hello all, new user here.
I have a 1999 F-250 4X4 7.3 lit Diesel engine. My problem is my transmission will go into reverse great no problem but it won't go forward. Thanks for any help. I have no problem rebuilding the transmission if thats what it needs, I just want to make sure there isn't a electrical issue from the PCM first? Thank again

 

Unfortunately there isn't anything electrical that can cause this to happen, it sounds like something mechanical is broken in the transmission.

 

What does it do when you drop it into drive? Stall the engine? Or just not do anything. I am finally at the end of my little ordeal with my 2000. And it was a bad PCM..Not the transmission. Mine would go into reverse fine also, but when I dropped it into drive, it would stall the engine. Unplug all the wire harneess on the tranny and put it in "limp" mode. If it goes into drive, (though rough and jittery driving) it's in the electircal aspect of the drivetrain.

 

someone said it might be the torque converter is bad or not in gauged on the pump?

 

The torque converter can't disengage from the pump. If it wasn't engaged on the pump you wouldn't have reverse, either.

 

If the torque converter was bad what would the symptoms be? I really thank you guys for all this help

 

Sorry but if the band is burnt up the there is most likely deeper more serious issues with the transmission.

 

Is this an E99? I know the earlier models did not have any cooler in the radiator. Do you often tow heavy with it? Also now might be a good time to upgrade to a bigger cooler from a 6.0 truck if you tow heavy often

 

There is only one band in this transmission. It is only used when the shift lever is in 2. Is that the band you're referring to? If the band is burnt up or not the trans will work normally when the shift lever is in D.

 

Guess I missed where the type of transmission was listed.

I will re-review to see.

And if the band was burnt up I doubt it would work normally as mentioned since the temperatures would have had to exceeded limts in most cases

 

My mistake I thought that I was in another forum

Evidently this is a E4OD?


I would suggest checking the fluid and see that is nice a cherry in color and the right level.

From there I would really check the wiring harness connection at the transmission and that at the range sensor. Disconnecting the harness and look for loose connections dirt ect. reseal with di-electric grease around the connectors edge.

test it

Then if nothing is found then drop the pan and see if there is much metal in the pan. If there is some there then it will probably be needing a rebuild.
If not then replace the filter and turn and drain the tc and refill. There a instruction procedure located in the technical arena of this FTE site.


Love getting into a pizzing match with Mark. He typically only provides string along information when he is supposedly a qualified expert. Thats why I like to post when he makes one liners.

 

No, it's a 4R100, but that's almost the same as an E4OD.

All of that is neat information, but a waste of time. It's broken. There is nothing electrical that can cause no forward gears.

The information the original poster needed was in the first post after his. Here it is again.
Yep, something mechanical broke inside the transmission. Checking the fluid or the electronics and dropping the pan won't get anyone any closer to fixing this. It just wastes time and money.

 

Your most likely correct. I thought the ranger sensor was a essential link to the solonoid activation.

Is that not true?

However OP you should still check your linkage.

 

Yes, a good range sensor is critical to proper solenoid operation. Whether or not the solenoids work the Traans will still engage at least one forward gear. If there are no forward gears something mechanical broke.

 

I have been pulling my hair out for the last week or so trying to figure out our transmission issue. I was hoping to draw on your experiences to help us out.
We have a 1999 F250 superduty 7.3 with a 4R100.

About a week or so ago our transmission started to overheat. It never got above 234. It happened two days in a row. So on day 3 we went and got a new filter and fluids to change it out. One the way to the parts store we were going up a hill and it came out of gear and felt like it went into neutral. We let it roll down the hill to a side street. We discovered we had no gears so we pushed it until it rolled down the hill and home. When we got home I turned off the truck and restarted it and we had all gears again....really odd to me. So we changed out the fluids and filter and drove it to the store. It overheated again, but we had all gears.
We figured that we had a clog somewhere so we pulled the cooling lines and checked. The coolant bypass valve was stuck open. We didnt have the part to fix it so it was cleaned and put back. Now this is where the extreme frustration sets in. When we go to drive it we have use of all gears until you take your foot off the gas, then it seems as if it is in neutral. You shut off the truck and restart and it is fine for a very short period. I have noticed that it will just go into neutral without taking your foot off the pedal, or maybe it is an unnoticed pressure change....IDK.
It has been sitting for a week with us starting it occasionally and trying to get it into gear. But it hasnt been driven. We recently added AMS transmission anti-slip fluid to it but it now wont go into gear. It was a sudden thing and we are at a loss. We need it to get to work and cant afford to just dump money into it blindly. Thank you in advance for your incite.